That’s exactly what I experienced with my Kenwood TH-D72! I think the problem is, when you only have a RX I-Gate in your range your sent out message/spot is correctly gated to SOTAwatch.
But you might not receive the answer by APRS2SOTA which should look like this:
If you receive the message by APRS2SOTA your device will answer by:
So if your handheld is not receiving an answer message it tries to send the message a few times (5 times on my Kenwood).
To prevent that unwanted messages beeing sent out I keep two “dummy” messages on my TH-D72 and edit it with the correct information. One for VHF FM and one for HF SSB. These look like:
OE/OO-000 07118 SSB OE5REO/P
OE/OO-000 145500 FM OE5REO/P
After sending out the edited message to APRS2SOTA I just put the handheld away and leave it running for a few minutes on the APRS frequency. Then I delete all new messages that are in the list … only keeping the two “dummy” messages for the next summit. So far that worked fine for me.
73 Martin, OE5REO